Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x....

  

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Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x. 4. Two spotlights, one blue and the other white, are placed 6.0 m apart on a track on the ceiling of a ballroom. A stationary observer standing on the ballroom floor notices that the angle of elevation is 45° to the blue spotlight and 70° to the white one. How high, to the nearest tenth of a metre, is the ceiling of the ballroom? Apply double-angle formulas to verify the identity cos (2x + 7) = - 2 -sin 2x. 4. Two spotlights, one blue and the other white, are placed 6.0 m apart on a track on the ceiling of a ballroom. A stationary observer standing on the ballroom floor notices that the angle of elevation is 45° to the blue spotlight and 70° to the white one. How high, to the nearest tenth of a metre, is the ceiling of the ballroom?

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